webadmin: Removed unused constructor

Presumably added before there was a split between NewVnicProfileModel
and EditVnicProfileModel, and was forgotten afterwards.

Change-Id: I0a35ed37a445a1251fad427b01d133c857e8c316
Bug-Url: https://bugzilla.redhat.com/1007279
Signed-off-by: Lior Vernia <lvernia@redhat.com>